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Circuit for Selecting Analog Signal Having Absolute Value of Greater Magnitude

IP.com Disclosure Number: IPCOM000034161D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-26

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Wooton, RM [+details]


Two bipolar analog voltage signals, which represent load currents as sampled by current sense resistors, are converted to absolute values of their respective magnitudes. The signal having the absolute value of greater magnitude is automatically selected and presented at a single output for use by following circuits. A selector circuit includes a precision rectifier or absolute value circuit 1 receiving an analog voltage signal A as its input and having an output voltage signal eo1, which is always negative irrespective of the polarity of the input signal A. The output signal eo1 from the circuit 1 is supplied as one input to a summing amplifier circuit 2.